Established in 2004, the Council on Library and Information Resources (CLIR) Postdoctoral Fellowship Program (program) had as its goal the recruitment, training, and creation of cohorts of new PhDs working within the library or cultural heritage digital environment to help manage, sustain, and generate valuable information in support of research and learning. With the data curation fellowships, introduced in 2012, the goal was for the fellows to "contribute to a more sophisticated understanding of data curation and its often determining role in the conduct of scientific and social science research" (Bishop and Williford 2019). This report: (1) discusses the methodology of the 2018-2022 assessment of the CLIR program; (2) provides an analytical review of prior program assessments; (3) identifies the types of data curated through the fellowships; (4) identifies differences in data curation across the different cohorts; (5) explores the challenges emerging from those curation activities; (6) identifies the impact of the fellows' work on their host organizations and communities; (7) assesses the impacts of the COVID-19 pandemic and contemporaneous social movement events on the fellows; and (8) identifies future priorities for the program.